Split System Air Conditioners
A split system is the UK's most popular fixed air conditioner: a slim wall-mounted indoor unit paired with an outdoor condenser. Because the compressor stays outside, splits run quietly and efficiently — most modern inverter splits double as heat pumps, so one unit cools in summer and heats in winter.
Every split system sold by Stockool ships free across the UK mainland and, because UK F-gas rules require certified installation, we'll match you with a local HVAC engineer to fit it — no hunting for a tradesperson yourself.
Professional installation required
These units must be fitted by a certified F-gas engineer. Use our free installer-matching service to find a vetted local engineer.
Why choose a split system air conditioner
- Inverter compressor — quiet, efficient and steady temperature control
- Reverse-cycle heat pump — efficient winter heating as well as summer cooling
- Wi-Fi & app control on smart-ready models (Alexa, Google Home, SmartThings)
- Professional F-gas installation matched for free through Stockool
All split system air conditioners
View all 60 units
Samsung 12000 BTU Smart A++ Wall Mounted Split Air Conditioner with Heat Pump
TCL 18000 BTU Smart A++ Wall Mounted Split Air Conditioner with Heat Pump
TCL 24000 BTU Smart A++ Wall Mounted Split Air Conditioner with Heat Pump
Toshiba RAS24 24000 BTU A++ Wall Mounted Split Air Conditioner with Heat Pump
Toshiba RAS16 16000 BTU A++ Wall Mounted Split Air Conditioner with Heat Pump
Midea Comfee 9000 BTU Smart A++ Wall Mounted Split Air Conditioner with Heat Pump
Samsung A++ 9000 BTU Wall Mounted Air Conditioner with Heat Pump
LG DualCool EZ24 Deluxe A++ 24000 BTU Smart Wall Mounted Split Air Conditioner with Heat Pump & Voice Control
Toshiba RAS9 9000 BTU A++ Wall Mounted Split Air Conditioner with Heat Pump
electriQ iQool 24000 BTU WiFi Smart A++ Wall Mounted Split Air Conditioner with Heat Pump - Black
Carrier CYRA A++ 9000 BTU Smart Wall Mounted Split Air Conditioner with Heat Pump
Midea Comfee 12000 BTU Smart A++ Wall Mounted Split Air Conditioner with Heat Pump
Split System Air Conditioners — frequently asked
Do split system air conditioners need professional installation?
Yes. UK F-gas regulations require a certified engineer to handle the refrigerant lines. Stockool matches every split-system buyer with a local, qualified installer so you don't have to source one separately.
Can a split system heat a room in winter?
Most inverter split systems are reverse-cycle heat pumps, so they provide efficient heating as well as cooling. Heat-pump heating typically costs far less to run than an electric space heater.
How loud is a split system indoors?
Indoor units are very quiet — typically 19 to 30 dB on low, roughly the level of a soft whisper. The noisier compressor is in the outdoor unit, mounted away from the living space.